PossumF250
Registered User
My 6.9 IDI burns almost a quart of oil to a tank of fuel, and all (or most) of that oil seems to be getting sucked through the CDR valve. When I realized the inside of the intake manifold was coated in oil, I replaced the CDR valve, but the problem continued. I thought the oil might be overfilled because when I changed the oil, I found it took almost 12 quarts to read full on the dipstick (when checked warm, not cold) instead of 10. This is with the Motorcraft IDI oil filter, not the bigger Powerstroke filter. However, I let it run "low" a couple times to what should have been around 10 quarts, and, based on the gray smoke that continued to come out the exhaust, it did not stop burning oil.
Does anyone have any ideas as to why it is sucking oil through the CDR valve, and why the owner's manual-specified 10 quarts barely shows up on the dipstick?
Does anyone have any ideas as to why it is sucking oil through the CDR valve, and why the owner's manual-specified 10 quarts barely shows up on the dipstick?